SPN is a popular overall structure of block cipher, and the differential cryptanalysis and linear cryptanalysis are the most powerful approaches to attack most symmetric block ciphers.

SPN结构是一种流行的分组密码总体结构；差分和线性分析是攻击分组密码的最强有力的方法。

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Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetric cryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.

第2部分(第4 ~ 7章)主要介绍现代密码学的基本技术，包括对称密码技术(分组密码、序列密码)、Hash函数、公钥密码技术等。

youdao

Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetric cryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.

第2部分(第4 ~ 7章)主要介绍现代密码学的基本技术，包括对称密码技术(分组密码、序列密码)、Hash函数、公钥密码技术等。

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